How do I change the phone number to which a temporary key is sent?

Hello,

Please follow these steps: ( also see the link below)

How to edit your 2FA setup (user)

After setting up 2FA, you can edit your existing setup if you want to remove a device, set up 2FA on another device, or view recovery codes.

1. Sign in to the Zoom web portal. 
2. In the navigation menu, click Profile.
3. Under Sign In, in the Two-factor Authentication section, use these options to set up 2FA on a new device or remove an existing setup:
   
   • Authentication App
     • Set Up: Set up 2FA using a supported 2FA app. This option is only visible if you don't have an existing 2FA setup that uses a 2FA app.
     • Change Device: Set up 2FA again using a supported 2FA app. This option is only visible if you have an existing 2FA setup that uses a 2FA app.
     • Remove Device: Remove the existing 2FA setup that uses a 2FA app.
   • SMS
     • Set Up: Set up 2FA using a phone number that can receive SMS. This option is only visible if you don't have an existing 2FA setup using SMS.
     • Remove Phone: Remove the existing 2FA setup that uses SMS.
     • Recovery Codes: Click View Codes to view a list of recovery codes. 

Link: https://support.zoom.us/hc/en-us/articles/360038247071-Managing-two-factor-authentication-2FA-

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